Electromagnetic device.



O. F. FORSBERG.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED SEPT. 29, 1909. 1,163,903.

3 SHEETS-SHEET I. Fig. I

Inventor:

Oscar F Fcrsbercg. y

COLUMBIA PLANOGRAPH co wAsr-lmu'roba 1m Patented Dec. 14, 1915.

0. F. FORSBERG.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED SEPT.29. 1909.

1,163,903. Patented Dec.14, 1915.

3 SHEETS-SHEET 2.

s9 52 57 la nun A I 75 6| i|' gvitnessesi inventor:

- Oscar F Forsberg COLUMBIA PLANOGRAPH c0.,wAs|-Imu'ro l. D. c.

' I ad-WM zqttg.

0. F. FORSBERG.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED SEP'LZQ, 1909.

1,163,903. Patented Dec.14,1915.

3 SHEETS-SHEET 3. Fig? FiQIZ O MUM l f H Inventor itnesses: Oscar FForsberg.

mwefi coLuMslA PLANOGRAPH CO..WASH1NGTON, D. c.

STATES PATENT OFFICE.

OSCAR a. roRsBEizG, 01 NEW ORK, N. Y., AssIG oR 'ro wEs'rEn ELECTRIC COMPANY,

or NEW YORK, N. Y.,;A conronATIoN or ILLINoIs.

ELECTROMAGNETIC 'nnvion,

Specification of Letters Patent.

. Patented Dec. 14., 1915.

Application filed September 29, 1909. Serial 170,526,162.

T0 zll'ivhom it may concern I Be it known that 1, Oscar: F. Fousnnne, citizen, of the United States, residing at N ew'York. in the county of New York and State of New York-,have invented a certain new and useful Improvement in Electra.

magnetic Devices. of which the-following is in. fully 'clear, concise and exact description.

My invention relates to electromagnetic devices and is particularly useful in connection with telephone apparatus known as combined jacks and signals.

One feature of the invention relates to the provision of a new and improved magnet and armature structure, which is highly eific'ient as to its electrical characterist cs and which permits the ready removal of the magnet coil forv purposes of repair.

Another feature of the invention consists in providing. as anintegral part of the magnetshell, wings upon which jack and 1 contact springs may be'mounted. a

My invention Wlll be'inore readily understood by reference to the accompanying" drawings, in which Figure 1 is a perspective view of a comhine'd jack and signal embodying my invention and showing the target in its operated position; Fig. 2 is a side elevation. partly in section. showing the parts in their normal pcsitl'o'ns; Flg. 3'is a partial sectional view showing, more. particularly, the con-p tact structure whereby the'electroma'gnet is connected in circuit, and also the 'night' alarm mechanismythe parts being in their normal positions; Fig. at is a par tial plan view, partly in section, showing the parts in their normal positions; Fig. 5 isa sectionalvi'ewon the line 5+5 of Fig. 4; Fig.

' ner of securing it in position, and the con-' tact structureassocia ed therewith; Fig. 9 is a vertical longitudinal sectional view of the target ea line 9 9 ofFi'g. lOqFigL 10 is a vrtieal transverse sectional viewlof the is a perspective view. of the target; Fig. 12

is 'a plan view'of a sheet metal blank from which the magnet shell may be formed; and Fig. 13 is a front elevation of the armature and arm carried thereby.

Like'characters of reference are used to designate like parts throughout the several figures.

Referring to the drawings, a mounting is body portion, 20 and 21 are wings or extensicn's and 22, 23, 24 and 25 are lugs. hen a blank of the form shown is properly formed into a shell. the body portion -19 serves as the shell proper. the wings or extensions serve as a mounting for the jack springs. and the lugs 22, 23. 24: and 25 provide means for readily securing the shell to the rear wall of the frame 15. said lugs being adapt,- ed to pass through suitable apertures in said wall and be secured thereto by swaging in a manner well understood.

Vithin the shell 19. as shown in Fig. 8.; is an electromagnet 26. said electromagnet being removably secured in position by means of a screw 27 passing longitudinally through the core 28 and engaging with some fixed part, as, for example. the rear wall of the frame 15'. The free end of the core of the electroma'gnet carries a circular pole piece 29. which may readily be made of a series of punched circular disks 30. 31 and 32. Mounted preferably upon the front face of the rear wall of frame 15, as shown inFigs; 3, 4 and 5. is a group of springs compris ng two U-shaped contact springs 33 and 3 the free ends of said springs lvine' adiacent apertures 35 and 36.. through which terminals 37 and 38 carried by the electromagnet may pass and make contact with said U-shaped springs; An armature 39 having an opening whereby it may loo'selv embrace the pole piece. is pivotally carried upon the rear end of the shell 19 the surface of which is entirely in one plane. Insulatively mounted uponthe wings or extensions -20 and 21 of the shell 19 are three by the lever 68 when the target is restored, and cup 54 is provided with an integrally formed'projection 63 adapted'to control the and 41 and a cut-off spring 42,. said line sprin s preferably being" disposed on opposite sides of the'extensions. and the entire group being secured thereto by means of screws 43 and 44 passing through apertures 45 and 46 in said extensions. The jack spring 40 and the cut-off spring 42 may be permanently connected with the U-sliaped contact springs 33 and 34, respectively, by means of suitable conductors, as, for example. the wires 47 and 48.

lVith the construction thus described, the electromagnet 26,wh en secured in position in the shell 19 by means of screw 27, is in electrical connectionwith the jack springs through the contact ofits terminals 37 and 38 with the U-shaped springs 33 and 34, and pole piece 29 is in operativerelation to the armature '39. 7 By merely unscrewing] the screw 27, the electromagnet 26 may be withdrawn through the armature 39 without opening: any soldered or other permanent electrical connections and without disturbing any associated par'tsi oted target 49-, preferably of approximately spherical form, said target being so mount ed as to protrude through a circular aperture in the plate 14 and rock freelytherei il v Referring particularly to Figs, 9, 10 and 11, the target may comprise segmental elements 50, "'51 and 52 embraced by two drawn cups 53 and 54 carried upon a shaft 55', the assembled structure being enameled or other-" wise provided with a white portion 74 and a black portion 75. The segmental element 50 is provided with a catch 56 and the segmental element 52 is'provided with a for Wardly extending projection 57. The catch target is restored, as more fully hereinafter described, lhe segmental element 51 is merely a distancepiece adapted to suitably separate the adjacent elements 50 and 52.

Cup 53 is providedjwith an integrally formed projection 6l, adapted 'to'b'e' engaged night alarm springs 64 and 65 when the target is released. The night alarm springs,

which preferably are L-shaped, may conveniently be insulatively comprised with the two Ushaped terminal contact springs 33 and'34 in a group secured to some suitable fixedpart adjacent the end of the electromagnet, as, forexa npldthe rear wall of the frame 15, by means of screws 66 and 67;

Referring to Figs. 1, 2, 3,4,6 and 7, a

bell crank lever-"68 is pivotally mounted Within the frame 15 is a centrally pivby the plug, to engage projection 61 of the tar et as hQIGlHEIftBIT'IIlOIQ fully described. Referring particularly to Fig. 6, 72 is a 5 jack thimble and 73 is an ordinary switchboard plug. 7

The mode of conne jack and signal with the telephone line cir- .cuit'will be readily understood without .de-

scription. j

Referringjto Figs. 2. 3 and 4 showing the parts in their normal positions, with the black portion 75 of-the target exposed, the energization of the electromagnet, as by ringing current from a generator at the sub 'scribers station, causes the armature 39 to be attracted and the arm 59 to'be lifted,

thereby disengaging the lateral projection A 58 from the catch 56 and allowing gravity ,to tilt the target in a counter-clockwise d1 "P66131011, as viewed, for example,- n Fig. 2.,

and bring it to its operatedposition with the white part 74 exposed, as shown in Figs. 1 and 7. In said operated. positiomtheproof the arm 71-of the bell crank lever 68, as shown in Fig. 1, and the projection 63 of the target is "resting upon the night, alarm spring 64, thereby forcing. it into contact with its companion spring 65, as shown in Fig. 7. When the operator inserts the plug 73 into the jack'in response to the signal,

the tip of the plug strikes the arm 69 of the cting the combined jection 6l of the target is adjacent-the end i I bell'crank lever 68, thereby tilting said lever projection 61, forcing said target to its nor hold the armature, as-sometimes occurs when said core is not of proper composition or not I and, throughthe medium of the arm 71 and properly annealed; the arm 59 will not be" 7 held in its'oper'ated position since the restoration of the target'will bring the forwardly extending projection 57 into engage merit with'the lateral projection 60 of-the arm 59 carried bythe armature 39, thereby forcing said armature to its normal position. It will readily be understood that without 7 the provision of this feature, the armature, I

if retained, as described,-by. residual magnetism, would hold the" arm-'59 in its elevated position and prevent the engagement of the catch 56, and lateral projection 58,

whereby the-target would; again fall to its operated position when the plug was withdrawn after conversation, thereby giving a false signal.

Although my invention is illustrated by embodiment in a signal wherein the armature is in the form of a ring, it will be readily understood that other forms might be used without exceeding its scope, as, for example, a forked armature or other form adapted to allow the electromagnet to be removed without disturbing adjacent parts. Also it is obvious that the feature of my invention which provides for the removal of the electromagnet is not limited, in its application, to combined jacks and signals, nor to electromagnets inclosed in shells, but may readilybe embodied in drops, relays or device employing an electromagnet wherein the return pole piece or other structure would interfere with the removal of the electromagnet laterally. These and similar modifications I regard as clearly within the scope of my invention. 7

Having described my invention, I claim:

1. In a combined jack and signal, a magnet coil, a core therefor, a magnetic shell surrounding said coil, the surface of one end of said shell being entirely in one plane, a circular pole piece, and a pivoted armature having a circular opening loosely fitting the exterior of said pole piece and coi5pcrating with said end of the magnetic shell.

2. In a combined jack and signal, a magnet coil, a core therefor, a magnetic shell surrounding said coil, the surface of one end of said shell being entirely in one plane, a circular pole piece carried by said core and located beyond the end of said shell, and a ring armature pivoted at the end of said shell and having its circular opening loosely fitting the exterior of said circular pole piece.

3. In a combined jack and signal, a magnet coil, a sheet metal shell surrounding said coil and having downwardly projecting wings, and jack and contact springs carried by said wings.

In witness whereof, I, hereunto subscribe my name this 27th day of September A. D.

OSCAR- F. FORSBERG. IVitnesses IRVING MACDONALD, EDGAR F. BEAUBIEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

